Concrete building-block.



PATENTED CCT. 3, 1905.

C. W. CARTER. CONCRETE BUILDING BLOCK.

APPLICATION TILED .TULY14,1904.

'PATENT OFFICF CLARENCE W. (jr-Ut'flh OF MlNNE'U-"OIAS, A\'l.lNNESOIA, ASSlHNOlt OF 'llVYQ- '.lHIRDS TO CHARLES S. 'lAIdElt'l AN l) EMIL ZIM MERHAN N, Ol" MINNE- A POLIS, )'IINNESOTA.

CONCRETE BUILDING-BLOCK.

Patented Oct. 3, 1905.

Application filed July 14,1904. Seria! No. 216,482.

To nl?, 1071/0771, 'it 'nt/ty concern:

new and useful Improvements in Concrete Building-Blocks, and I do hereby declare the following to be a full, clear, and exact description of the invention, suoli as will en- Io able others skilled in the ai't to which it appertains to make and use the same.

1\Iy invention relates to the construction of artificial building-blocks from concrete and similar material, and has for its object to` improve the same in the several particulars hereinafter noted.

It is a well-known fact that frost will readily pass through bodies of concrete and generally through stone, whether artificial 2o or natural. IIe-nce it has in practice, and especially in colder northern climates, been found necessary to lfurrow out the plaster applied to the interior of the walls of a building, whereas except for the passage of frost. 2 5 and moisture through the walls the plaster.

could be applied at much less expense and in a more satisfactory manner directly to the inner surfaces of the walls formed by the concrete blocks.

3o In accordance with my invention I construct the concrete body of the block with inner and outer sections and space these sections apart, but rigidly tic the same together by means of bridges or tie-plates, the ends of which are embedded and anchored in the said concrete sections and which bridges oi` tie-plates are constructed of wood or other rigid fibrous iiiateiial, which is a poor or slow conductor of frost. In virtue of this 4o construction the frost will not pass to any perceptible extent from the outer surface to the inner surface of a wall constructed of these improved building-blocks, and hence the plaster' may without objection be applied directly to the inner surface of the said wall.

Several forms of the ii'nproved buildingblock are illustrated in the accompanyingr drawings, wherein like characters indicate 5o like parts throughout the several views.

Figure l is a perspective view showing a buildiiig-block constructed in accordance with my invention; and Figs. 2 and ii are lviews corresponding to Fig. Beit known that I, CiniiiiaNcn W. Ciiiirnii,

a citizen of the United. States, residing at Minneapolis, in the county of I-Iennepin and l,

5 State of Minnesota, have invented certain i 1, but with parts broken away and illustrating` slightlymodified constructions.

The numeral 1 indicates the sections of the concrete body of block, which sections, as shown, are formed on their opposing faces with depressions or corrugations 2, leaving between them opposing projections 3, into which, as shown, are embedded the ends of wooden bridge-plates L1. These bridgeplates 4 preferably extend from the bottoms to the tops of the sections 1, and they. serve to space apart, but rigidly imite, the said sections. ith the bridge-plates L1 formed nnperforate at their exposed portions and extended froin top to bottom of the block the cavity between the concrete sections of the 7o block is divided into a plurality of independent air-spaces.

In Fig. 1 the ends of the bridge-plates 4 are shown as formed with vertical grooves 5, which cause them to interlock with the said block-sections 1. In the construction illustrated in Fig. 2 nails G, driven through the ends of the bridge-plates 4, interlock said plates to the block-sections l. In the construction illustrated in Fig. 3 the ends of the 8o bridge-plates 4 are shown as provided with perforations 7, into which the concrete when in plastic condition will run to interlock the said blocks and bridge-plates.

In the process of manufacture of said blocks a core or cores will be used to form the iiregular or corrugated opposing surfaces of the concrete block-sections, and the bridgeplates will be suitably supported within the mold while the plastic concrete is forced 9o around the ends of the saine in the act of giving forni to the said sections. When the concrete cement sets, the ends of the bridgeplates will be securely-anchored in the concrete block-sections. Even when the ends of the bridge-plates are left smooth the concrete will firmly set around the saine and adhere thereto. The so-called bridges or bridgeplates, it will of course be understood, may take a great manyv different forms, and it will also be understood that the concrete sections of the block may be given any desired or suitable form.

`That I claim, and desire to secure by Letters Patent of the United States, is as ff' lows:

IOC

A biiiIding-block having its bod)T eoni viding the space between the same into coinlo sbrueted in seetlons formed el concrete, and pertinents, substantially :is descrilied.

bridge plates constructed o" fibrous nizibe- In testimony whereof I affix my siglmture rml which is a poor conductor of heat, :md in presence of two witnesses, moisture, sfild bridge-plates having their CLARENCE W CARTER ends embedded in said concrete sections, to

rigidly unite, but space apart, the seine, the Witnesses:

said bridge-plates extending from bottom to R. C. MABEY, top of said concrete block-sections, and di- F. D. MERCHANT. 

